Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"hydrocode"”.
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Hydrocode modeling of oblique impacts into terrestrial planets
… sufficiently deep magma ocean. I have performed hydrocode simulations that revise this assumption and yield a clearer picture of the impact process for differentiated planetesimals possessing iron cores with radius = 100 km that impact into magma oceans. The impact process strips away the …
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Numerical Study of Energy Loss Mechanisms in Oscillating Underwater Explosion (UNDEX) Bubbles
In this study a modern hydrocode, blastFoam, that was designed for multi-phase compressible flow problems with applications suited for high-explosive detonation was investigated for underwater explosion (UNDEX) events. The problem of over-prediction for long-term UNDEX bubble behavior in modern …
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The Formation of Distal Impact Ejecta
… vapor plume using a one dimensional Lagrangian hydrocode. The condensation of droplets is treated by directly coupling the equations for homogeneous nucleation and growth with our hydrocode. The second model is focused on less energetic material ejected as part of the excavation flow. Using the …
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The Chicxulub impact event and the environmental catastrophe at the end of the Cretaceous Period
… these impact-related perturbations is through hydrocode models of the impact event. Few simulations of the Chicxulub impact event have previously been done. In these simulations the event was modeled as an asteroid impact, using two-dimensional hydrocodes that permit modeling only vertical …
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Study of magnetohydrodynamic effects for the Richtmyer-Meshkov instability
… growth is of interest. Simulations utilized the hydrocode FLAG, developed at Los Alamos National Laboratory, are performed on a 2D shock cylinder plasma-air interface where MHD effects work to remove vorticity from the interface and suppress RM growth. To study this magnetic field orientation, …
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Numerical Modeling of Friction Stir Welding: A Comparison of Alegra and Forge3
… capabilities of ALEGRA, a Sandia National Labs hydrocode, and Forge3, a Transvalor S.A. product, to accurately model the Friction Stir Welding Process. ALEGRA and Forge3 are discussed in light of the inherent challenges of modeling Friction Stir Welding, and a rotational boundary condition is …
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Exploration of a superposition and reconciliation based approach to cell-centered Lagrangian hydrodynamic methods
… for mesh movement were analyzed on an existing hydrocode by Pierre-Henri Maire (PHM) and a truncated form of the Runnels-Gilman method (implemented without using the reconciliation forces as additional forces to form a new hydro method called the Runnels-Gilman method). Results from both the 1D …
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Numerical Modeling of Blast-Induced Liquefaction
… LS-DYNA, a commercially available finite element hydrocode, was the solver used to simulate the event. A new geo-material model developed under the direction of the U.S. Federal Highway Administration was applied to evaluate the liquefaction potential of saturated sandy soil subjected to …
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Investigating detonation fronts in small explosive charges using a wave shaper
… become. Investigation into whether a commercial hydrocode (ANSYS Autodyn) can correctly account for these phenomena was also explored. Shock physics, modeling, and experiments using high speed imaging are combined to better understand the function of a wave shaper and its effect on detonation …
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Finite-element modeling of large impact craters: Implications for the size of the Vredefort structure and the formation of multiple ring craters
… In collaboration, E. Pierazzo and I used both hydrocode and finite-element modeling to recreate the formation of the Vredefort structure in order to predict where the pressure of an impact-generated shock wave would have been sufficient to form shatter cones and planar deformation features and …
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Determining the Reaction Zone Length in Shock Initiated PETN
… was the creation of consistent target samples. A hydrocode incorporating the CREST reactive model was written to numerically model the detonation and provide a predictive capability. The results of the experiments were used to set the values of the parameters in the simulation.
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Numerical Modelling of Detonation and Ignition of Condensed Phase Explosives
… without the use of computationally intensive hydrocode simulations. The validity and limitations of this approach are demonstrated through its application to simulated gauge data for an idealized explosive. The resulting rate law is then used in simulations of shock to detonation transition, …
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Analysis and simulation of small scale microwave interferometer experiments on non-ideal explosives
… in 2d as well as 3d using the shock physics hydrocode CTH. An ignition and growth reactive burn (IGRB) model was developed for non-ideal explosives, and shown to be relevant to capturing the behavior of some of the overdriven failing detonation waves. Many simplifying assumptions were made, …